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1·How exactly the chemical plays a role still remains a mystery.

这种化学物质究竟是如何发挥作用的仍然是一个谜。

2·However, the exact cause of many sightings still remains a mystery.

然而，许多目击事件的确切原因仍然是个谜。

3·This veteran cadre still remains his philosophy of hard work and plain-living.

这位老干部仍然保持着艰苦朴素的作风。《新英汉大辞典》

4·The source of the gunshots still remains a mystery.

枪弹来自何处依然是一个迷。《柯林斯英汉双解大词典》

5·The decline of our fish stocks may have changed the landscape forever, but the kipper, a cold-smoked herring, still remains one of the great tastes of England.

虽然近年来我们的鱼类储量下降，可能永远无法再现曾经的风光，但冷烟熏制的熏鲱鱼仍是英格兰最美味的食物之一。

6·The question of whether the decrease in plant fecundity caused by the spraying of pesticides actually causes a decline in the overall population of flowering plant species still remains unanswered.

喷洒杀虫剂导致的植物繁殖力下降是否真的会导致开花植物物种总数的下降，这个问题仍然没有答案。

7·The 45-year-old man who is in misogamy still remains single.

那个厌恶结婚的男人至今45岁了仍保持单身。

8·The question still remains unsettled.

这个问题仍未解决。《新英汉大辞典》

9·The victim still remains unknown.

受害人仍然身份不明。

10·The danger still remains.

现在这种危险仍然存在。